Patent GB-992573-A (GB)
Title: Heating packages
IPC: B65D81/34
Filed: 1960-04-14
Abstract: 992,573. Heating packaged food. P. EISLER. April 14, 1961 [April 14, 1960], No. 1585/65. Divided out of 992,571. Heading A2D. [Also in Divisions A4, B5 and B8] A package incorporating a heating film intended to be thrown away with the container or wrapper is adapted to allow the contents to be displaced by the application of external pressure. The package may be a flexible or collapsible tube, incorporating a heating element in the tube, or in a nozzle or container, attached or adapted to be attached to the tube. Alternatively the package may be a rigid or flexible bottle incorporating an oval cross-section siphoning tube (Fig. 16 not shown) incorporating the heating film. The contents may be deep frozen, hard butter or other fats, icing materials, hard bread spreads, chocolate, waxes, glues, hot-melt-adhesives, solventless paints and inks, bituminous and other gap filling compounds, viscous oils and pastes, resins, thermoplastics and elastomeric compounds, e.g. moulding compounds. In one form (Fig. 1) a portion 37 of the wrapper is torn off to expose terminal areas of the heating films 35 and a low voltage supply has been passed through the film until the contents reach the desired temperature, at which point the heat breaks a thermoplastic seam 38 to allow the contents to be squeezed out by folding back the flaps 36. In a modification (Fig. 2 not shown) the tube is rolled up about a rigid seam to expel the contents. In a further embodiment (Figs. 4 and 5 not shown) a flexible tube has a broad flat heating nozzle attached to it. Fig. 6 shows a flexible lining tube 59 enclosed in a rigid but collapsible frame 61. The heater is incorporated in the nozzle 58. Fig. 8 shows a second container 65 consisting of a plurality of heating films 66 coated with anti-stick films of cellulose material. Pancake mixture is forced from a flexible tube 68 into regions between the films and the pancakes are cooked in this position. A similar arrangement may be used for the production of very small quantities of simple mouldings. The heating films may be positioned in the second container so that they are eventually enclosed by the moulded articles and remain in it. The heating film may form a partition between two compartments of a collapsible tube each compartment containing one component of a mixture e.g. an elastomer curing at room temperature. The nozzle of a tube may be in the form of an extrusion die, and in the case of a two compartment tube, this could be used to produce an adhesive tape consisting of a thermoplastic layer and an adhesive layer. One such two compartment tube (Fig. 14) has a heating film 82 and a hand rotated screw feed 84. A chain of packages 43 (Fig. 3) each incorporating a heating film are arranged in a vending machine. When a coin is inserted, a roller 46 is raised to connect the package above the dispensing position to a low voltage supply, and when the pack has been heated the roller 46 rotates and a cutter 48 cuts a slot in the package and then the roller 46 is lowered, while rollers 49 together with a belt 45 feed the chain so that the next package is brought into position. The contents of the heated package are squeezed through the slot by the rollers 49. The empty packages are passed into a storage container 52. Specifications 900,515, 900,516, 900,517, 905,867, 912,980 and 973,211 also are referred to.